If it's always shown, then there's likely an issue with an add-on/templates or a server issue. Otherwise, you shouldn't practically run into it (unless you leave pages open for days).
when you say you leave pages for days, does that mean when you check the "Stay Logged in" on login bar form?
Does the error happen every time?
Some guesses:
1) You were idle for too long before submitting the form.
2) You are running suhosin (hardened php). Suhosin can truncate form submissions if limits are exceeded. If the security token is truncated it will result in this error.
3) An addon or customization that is misbehaving.
I ad this issue pop up for a PayPal button. I setup a BBcode for paypal button and the ID is the special paypal code. Is there a better way to do this?
Please post the code for your button.
If the ID in question expires then that is a problem.
This worked like a charm, thank you! Still have 24 pages of spam users that somehow made it through the approval, but I can't find the batch updates user tool to mass delete them.In this case, you're running into PHP's max_input_vars setting. Increasing it can be a little tricky, so the easiest thing to do is to manually delete (via the user edit page) 5-10 of those users. Alternatively, if you're deleting all of them, you can use the batch update users tool to identify them by their user state and delete them.
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